A320577 - cp's OEIS frontend

A320577 Number of isosceles triangles whose vertices are the vertices of a regular n-gon.

n	a(n)
3	1
4	4
5	10
6	8
7	21
8	24
9	30
10	40
11	55
12	52
13	78
14	84
15	95
16	112
17	136
18	132
19	171
20	180
21	196
22	220
23	253
24	248
25	300
26	312
27	333
28	364
29	406
30	400
31	465
32	480
33	506
34	544
35	595
36	588
37	666
38	684
39	715
40	760
41	820
42	812
43	903
44	924
45	960
46	1012
47	1081
48	1072
49	1176
50	1200
51	1241
52	1300
53	1378
54	1368
55	1485

[1, 4, 10, 8, 21, 24, 30, 40, 55, 52, 78, 84, 95, 112, 136, 132, 171, 180, 196, 220, 253, 248, 300, 312, 333, 364, 406, 400, 465, 480, 506, 544, 595, 588, 666, 684, 715, 760, 820, 812, 903, 924, 960, 1012, 1081, 1072, 1176, 1200, 1241, 1300, 1378, 1368, 1485]

cp's OEIS Frontend

A320577 Number of isosceles triangles whose vertices are the vertices of a regular n-gon.

Table of values

List of values